I got a pile of LEDs from Superbright for the overhead fixtures in my TT. More light than the original bulbs! All my fixtures use a wedge base, and 1/4 of the bulbs I received didn't work. The bases did not fit well, and I eventually got some to work, but sent the ones back that we're dead even on direct wiring. one of the replacements was DOA also, so I've given up on that vendor for my own particular fixtures.